oily problem... - Team Camaro Tech
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post #1 of 14 (permalink) Old Dec 26th, 04, 05:03 AM Thread Starter
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robert
 
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well i did a little check up on my new 355ci.

compression test: with all plugs out and i let the engine crank ten times for each cylinder.

best compr was 145 psi, the worst was 125 psi.

(if i run the engine at 4000rpm or so, it reads 170 psi).

but every sparkplug i took out was oily, the threads that is and the tips were dry black.

even the holes in the heads have black oil spots. it looks like it dripped out of it.

It doesnt come from the valve covers because i cant see any runs from there, it starts at the plug holes.

ill re-torque the head bolts and readjust the rockers, but im concerned about that oil thing.

what can it be?

Z28 1984
'77 355ci/COMP cam 218/224 .464/.470 114 LSA
rollerrockers1.5/9.72 forged pistons
ported '66 461 heads 1.94,1.5/Flowtech shorty headers
edelbrock 600/performer rpm intake
th350/shiftkit/hughes2500stall
4th gen 3.23 10 bolt POSI.
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post #2 of 14 (permalink) Old Dec 26th, 04, 09:53 AM
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Rick
 
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My guess is valve guide seals. - that's what I experienced along with some valve guide wear, too. Are the tips sooty black or shiny black? Sooty, to me, would be a rich condition, shiny black - oil.

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post #3 of 14 (permalink) Old Dec 27th, 04, 09:09 AM Thread Starter
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robert
 
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what about that PSI?

i cant believe all the guide seals are leaking!, they are brand spanking new!

Z28 1984
'77 355ci/COMP cam 218/224 .464/.470 114 LSA
rollerrockers1.5/9.72 forged pistons
ported '66 461 heads 1.94,1.5/Flowtech shorty headers
edelbrock 600/performer rpm intake
th350/shiftkit/hughes2500stall
4th gen 3.23 10 bolt POSI.
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post #4 of 14 (permalink) Old Dec 27th, 04, 03:07 PM
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hey Robert, your cranking compression sounds awful low... I'd wonder about that. Maybe pull the pcv and see if you're getting a lot of blowby.

Also, I've seen plugs oil the threads like that if they're too cold a heat range, you might try 1 or 2 steps hotter, see if those stay clean.





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post #5 of 14 (permalink) Old Dec 27th, 04, 06:30 PM
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Did you prop the throttle blades open during the test? Those figures do seem a bit low, but that could also depend on your cam. Sounds like it's out of spec (13%) from your results. And I'm curious about your 175psi at 4000RPM - did you actually run the motor with a compression guage installed?

When the engine was bored and honed, did the machinist use a deck plate torqued to spec? Are the compression rings properly indexed. What are the rings made of? Probably not too surprising to see a little oil on the plugs if this is the first firing.

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post #6 of 14 (permalink) Old Dec 27th, 04, 08:24 PM Thread Starter
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robert
 
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i just bought a set of speedpro forged pistons complete with rings and so.

i played with the throttle when i connected the gauge.

i bought the bare block allreay honed and bored, so i dunno.

i forged the throttle open with a piece of wire, but i forgot about the lower blades, ill try that today.

Z28 1984
'77 355ci/COMP cam 218/224 .464/.470 114 LSA
rollerrockers1.5/9.72 forged pistons
ported '66 461 heads 1.94,1.5/Flowtech shorty headers
edelbrock 600/performer rpm intake
th350/shiftkit/hughes2500stall
4th gen 3.23 10 bolt POSI.
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post #7 of 14 (permalink) Old Dec 28th, 04, 01:06 AM
 
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RR,

How many miles does it have on it b/c it may just not be broken it yet??

I don't check for stuff like this until after my first oil change which is generally like at 500 miles after commuting back and forth to work for a while so that it is good and broken in is all.. Then I start changing my oil and filter at a longer interval..

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post #8 of 14 (permalink) Old Dec 28th, 04, 06:28 AM Thread Starter
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robert
 
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well it had about 150 miles on it, maybe less.

more like 100 miles.

well maybe thats it then, huh?

thanks

Z28 1984
'77 355ci/COMP cam 218/224 .464/.470 114 LSA
rollerrockers1.5/9.72 forged pistons
ported '66 461 heads 1.94,1.5/Flowtech shorty headers
edelbrock 600/performer rpm intake
th350/shiftkit/hughes2500stall
4th gen 3.23 10 bolt POSI.
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post #9 of 14 (permalink) Old Dec 28th, 04, 08:09 AM
 
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Hope it is something that easy...
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post #10 of 14 (permalink) Old Dec 28th, 04, 09:59 AM
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Kyle
 
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I agree everything needs sometime to seat properly. your compression is low for a new engine but give the rings some driving time and i bet you will see things change shortly. If not post back someone here should be able to help they are a good bunch of guys.

1969 Z/28 CLONE 350
4 SPD MUNCIE,
4 WHEEL DISK BRAKES,
4:11 POSI
BLUE W/WHITE STRIPES


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post #11 of 14 (permalink) Old Dec 31st, 04, 09:42 PM
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i agree,i noticed a considerable change in performance at about the 500 mile mark,however these were cast rings,what kind of rings are you using?going up 2 heat ranges is probably a good idea too.
but most importantly change the oil at 500 miles and,while you're at it,change the plugs at the same time.
but if the oil and coolant look ok,imo,go do some drivin!could be the plugs just loaded up from a lot if idling during setup.
E

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post #12 of 14 (permalink) Old Jan 1st, 05, 07:25 AM
 
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This stuff is why I start right off the bat and daily drive my motors, commuting back and forth to work.

I like to get EASY, fluctuating miles/rpm's on them quickly so everything will seal asap..

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post #13 of 14 (permalink) Old Jan 1st, 05, 07:43 AM
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Craig
 
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You guys are saying a compression of 145 is low? I did a compression test on my 350 a few months back and all were between 145-150. I was told that was good compression. Now you guys got me wondering. Thoughts?


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post #14 of 14 (permalink) Old Jan 1st, 05, 09:55 AM
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What's good "depends"...

An 11:1 406 better pump 180 plus, unless it's got a bunch of cam.

His 355 with the 274xe and 64cc vette heads... I'd expect 160-170 once everything was seated.

I don't know enough about yours to guess... but 145-150 ain't bad. Nice and even like that is always good tho.

I was mostly looking at the low side at 125, along with the oily plugs... just a somewhat worrisome combination of things.





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